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  JVM性能检测、故障检测工具
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      <a href="/2020/07/21/JVM%E6%80%A7%E8%83%BD%E6%A3%80%E6%B5%8B%E3%80%81%E6%95%85%E9%9A%9C%E6%A3%80%E6%B5%8B%E5%B7%A5%E5%85%B7/" class="article-date">
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<h1 id="JPS：虚拟机进程状况工具"><a href="#JPS：虚拟机进程状况工具" class="headerlink" title="JPS：虚拟机进程状况工具"></a>JPS：虚拟机进程状况工具</h1><blockquote>
<p>jps(JVM Process Status Tool)，可以列出正在运行的虚拟机进程，并显示虚拟机执行主类(Main Class，Main()函数所在的类)名称以及这些进程的本地虚拟机唯一ID(LVMID,Local Virtual Machine Identifier).</p>
</blockquote>
<p>JPS主要用于查询LVMID来确定需要监控的是哪一个虚拟机进程。对于本地虚拟机进程，LVMID与操作系统的进程ID一致，但如果同时启动了多个虚拟机进程，无法根据进程名称定位时，就必须依赖jps命令显示主类的功能才能区分。</p>
<blockquote>
<p>jps命令格式：jps [ options ] [ hostid ]</p>
</blockquote>
<table>
<thead>
<tr>
<th>选项</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td>-q</td>
<td>只输出LVMID，省略主类的名称</td>
</tr>
<tr>
<td>-m</td>
<td>输出虚拟机进程启动时传递给主类main()函数的参数</td>
</tr>
<tr>
<td>-l</td>
<td>输出主类的全名，如果进程执行的是jar包，则输出jar路径</td>
</tr>
<tr>
<td>-v</td>
<td>输出虚拟机进程启动时的JVM参数</td>
</tr>
</tbody></table>
<blockquote>
<p>JPS执行样例：</p>
</blockquote>
<div align=center>
<img src="http://fahoud.gitee.io/hexo-dist/jvm/JVMjps.png" width=""></div>

<h1 id="jstat：虚拟机统计信息监视工具"><a href="#jstat：虚拟机统计信息监视工具" class="headerlink" title="jstat：虚拟机统计信息监视工具"></a>jstat：虚拟机统计信息监视工具</h1><blockquote>
<p>jstat(JVM Statistics Monitoring Tool)是用于监视虚拟机各种运行状态信息的命令行工具。可以显示本地或者远程虚拟机进程中的类加载、内存、垃圾收集、即时编译等运行时数据，在没有GUI图形界面、只提供了纯文本控制台环境的服务器上，它将是运行期定位虚拟机性能问题的常用工具。</p>
</blockquote>
<blockquote>
<p>jstat命令格式为：jstat [ option vmid [ interval[s|ms] [count] ] ]</p>
</blockquote>
<table>
<thead>
<tr>
<th>选项</th>
<th>作用</th>
</tr>
</thead>
<tbody><tr>
<td>-class</td>
<td>监视类加载、卸载数量、总空间以及类装载所耗费的时间</td>
</tr>
<tr>
<td>-gc</td>
<td>监视Java堆状况，包括Eden区、2个Survivor区、老年代、永久代等的容量，已用空间，垃圾收集时间合计等信息</td>
</tr>
<tr>
<td>-gccapacity</td>
<td>监视内容与-gc基本相同，但输出主要关注Java堆各个区域使用到的最大，最小空间</td>
</tr>
<tr>
<td>-gcutil</td>
<td>监视内容与-gc基本相同，但输出主要关注已使用空间占总空间的百分比</td>
</tr>
<tr>
<td>-gccause</td>
<td>与-gcutil功能一样，但额外输出导致上一次垃圾收集产生的原因</td>
</tr>
<tr>
<td>-gcnew</td>
<td>监视新生代垃圾收集状况</td>
</tr>
<tr>
<td>-gcnewcapacity</td>
<td>监视内容与-gcnew基本相同，输出主要关注使用到的最大、最小空间</td>
</tr>
<tr>
<td>-gcold</td>
<td>监视老年代的收集状况</td>
</tr>
<tr>
<td>-gcoldcapacity</td>
<td>监视内容与-gcold基本相同，输出主要关注使用到的最大、最小空间</td>
</tr>
<tr>
<td>-gcpermcapacity</td>
<td>输出永久代使用到的最大、最小空间</td>
</tr>
<tr>
<td>-compiler</td>
<td>输出即时编译器编译过的方法、耗时等等信息</td>
</tr>
<tr>
<td>-printcompilation</td>
<td>输出已经被即时编译的方法</td>
</tr>
</tbody></table>
<blockquote>
<p>jstat执行样例：</p>
</blockquote>
<div align=center>
<img src="http://fahoud.gitee.io/hexo-dist/jvm/JVMjstat.png" width=""></div>

<p>-gccause说明：</p>
<ul>
<li>新生代Eden区（E）使用了82.08%的空间，</li>
<li>S0（Survivor区）为空，S1占比41.42%，</li>
<li>老年代（O区）使用22.7%的空间，</li>
<li>压缩类空间和元数据空间分别占比92.9%和93.64%，</li>
<li>Minor GC次数一共发生215次，总耗时2.389s, Full GC触发4次，总耗时0.781s， 所有GC总耗时(GCT)为3.171s。</li>
</ul>
<blockquote>
<p>-gccause的LGCC(Last GC Cause)表示上一次GC发生原因为Allocation Failure，内存分配失败，如Eden区满导致Minor GC或老年代最大连续空间无法存入大对象导致Full GC。</p>
</blockquote>
<p>使用jstat工具在纯文本状态下监视虚拟机状态变化，在用户体验上不如JMC、VisualVM等可视化监视工具直接以图表形式展现的直观，但在实际生产环境中，多数服务器管理员已经习惯了在文本控制台工作，直接在控制台使用jstat命令依然是一种常用的监控方式。</p>
 
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</div>

<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.css">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/default-skin/default-skin.min.css">
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/photoswipe@4.1.3/dist/photoswipe-ui-default.min.js"></script>

<script>
    function viewer_init() {
        let pswpElement = document.querySelectorAll('.pswp')[0];
        let $imgArr = document.querySelectorAll(('.article-entry img:not(.reward-img)'))

        $imgArr.forEach(($em, i) => {
            $em.onclick = () => {
                // slider展开状态
                // todo: 这样不好，后面改成状态
                if (document.querySelector('.left-col.show')) return
                let items = []
                $imgArr.forEach(($em2, i2) => {
                    let img = $em2.getAttribute('data-idx', i2)
                    let src = $em2.getAttribute('data-target') || $em2.getAttribute('src')
                    let title = $em2.getAttribute('alt')
                    // 获得原图尺寸
                    const image = new Image()
                    image.src = src
                    items.push({
                        src: src,
                        w: image.width || $em2.width,
                        h: image.height || $em2.height,
                        title: title
                    })
                })
                var gallery = new PhotoSwipe(pswpElement, PhotoSwipeUI_Default, items, {
                    index: parseInt(i)
                });
                gallery.init()
            }
        })
    }
    viewer_init()
</script>

<!-- MathJax -->

<!-- Katex -->

<!-- busuanzi  -->


<script src="/js/busuanzi-2.3.pure.min.js"></script>


<!-- ClickLove -->

<!-- ClickBoom1 -->

<!-- ClickBoom2 -->

<!-- CodeCopy -->


<link rel="stylesheet" href="/css/clipboard.css">

<script src="https://cdn.jsdelivr.net/npm/clipboard@2/dist/clipboard.min.js"></script>
<script>
  function wait(callback, seconds) {
    var timelag = null;
    timelag = window.setTimeout(callback, seconds);
  }
  !function (e, t, a) {
    var initCopyCode = function(){
      var copyHtml = '';
      copyHtml += '<button class="btn-copy" data-clipboard-snippet="">';
      copyHtml += '<i class="ri-file-copy-2-line"></i><span>COPY</span>';
      copyHtml += '</button>';
      $(".highlight .code pre").before(copyHtml);
      $(".article pre code").before(copyHtml);
      var clipboard = new ClipboardJS('.btn-copy', {
        target: function(trigger) {
          return trigger.nextElementSibling;
        }
      });
      clipboard.on('success', function(e) {
        let $btn = $(e.trigger);
        $btn.addClass('copied');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-checkbox-circle-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPIED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-checkbox-circle-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
      clipboard.on('error', function(e) {
        e.clearSelection();
        let $btn = $(e.trigger);
        $btn.addClass('copy-failed');
        let $icon = $($btn.find('i'));
        $icon.removeClass('ri-file-copy-2-line');
        $icon.addClass('ri-time-line');
        let $span = $($btn.find('span'));
        $span[0].innerText = 'COPY FAILED';
        
        wait(function () { // 等待两秒钟后恢复
          $icon.removeClass('ri-time-line');
          $icon.addClass('ri-file-copy-2-line');
          $span[0].innerText = 'COPY';
        }, 2000);
      });
    }
    initCopyCode();
  }(window, document);
</script>


<!-- CanvasBackground -->


    
    <div id="music">
    
    
    
    <iframe frameborder="no" border="1" marginwidth="0" marginheight="0" width="200" height="52"
        src="//music.163.com/outchain/player?type=2&id=1349892027&auto=1&height=32"></iframe>
</div>

<style>
    #music {
        position: fixed;
        right: 15px;
        bottom: 0;
        z-index: 998;
    }
</style>
    
  </div>
<script src="/live2dw/lib/L2Dwidget.min.js?094cbace49a39548bed64abff5988b05"></script><script>L2Dwidget.init({"log":false,"pluginJsPath":"lib/","pluginModelPath":"assets/","pluginRootPath":"live2dw/","tagMode":false});</script></body>

</html>